Research On Key Technologies In Optical Multiple Wavelength 3R Regeneration And Optical Packet Switching

In this dissertation, the research work are carried out mainly on the key technologies in two fields including optical multiple wavelength 3R regeneration and optical packet switching.On the optical multiple wavelength 3R regeneration technologies, we first build up a theoretical model for the fiber optic parametric amplification (FOPA). The nonlinear gain response of FOPA is especially characterized and discussed. Based on the theoretical analysis, we further experimentally investigate the performance of the optical regenerator by using single pumped FOPA as an optical decision gate, and thus verify the feasibility of the FOPA being used in the optical 3R regeneration.We propose a novel scheme for the optical regeneration of multiple synchronouswavelength division multiplexing (WDM) channels, in which the data signal is usedas the pump in the FOPA with orthogonally polarized adjacent channels and bi-directional operation. Based on this scheme, simultaneously optical 3R regeneration of 4×40 Gb/s synchronous WDM channels is experimentally achieved byusing a single section of highly nonlinear fiber (HNLF). Negligible difference is observed comparing the performance of multiple wavelength operation with the single wavelength case.We propose for the first time a novel scheme for the optical regeneration of asynchronous multiple wavelength signals. By using phase clock pumped FOPA with the adjacent wavelength channels being orthogonally polarized, simultaneouslyre-shaping and re-timing of two asynchronous 10 Gb/s RZ-OOK channels are experimentally demonstrated. Power penalty improvements of 2 dB and 1.5 dB are achieved in single and dual-channel operation respectively.On the optical packet switching technologies, massive research work is carried out on the optical in-band labeling technique for the large scale and low latency optical packet switch. By using the OOK optical in-band labeling, we demonstrated for the first time 1×4 dynamic optical packet switching of the 640 Gb/s single wavelength OTDM packets with clock distribution after 50 km dispersion compensated fiber transmission link. Error free operation with less than 3 dB penalty is achieved.We propose a RF tone in-band labeling technique that is able to allow the optical packet switch with an exponential increase of the scale. By using this labeling technique, Error free optical packet switching operation of 160 Gb/s single wavelength OTDM packets and 40 Gb/s NRZ/RZ OOK packets is achieved with negligible penalty introduced. Further investigations are carried out on the scalability, latency and power fluctuation tolerance of the RF tone in-band labeling technique. The results show that at least 30 label bits can be potentially delivered in a single in-band wavelength while using the RF tone in-band labeling.We demonstrate for the first time 40 Gb/s 64×64 operation of a modular large port count optical packet switch with highly distributed control. The switch shows less than 1.6 dB penalty after dynamic switching, 25ns latency and record low energy consumption of 76.5 pJ/bit. Further investigations also show that the switch can be further scaled to logically 4096×4096 (64 input and output fiber, each fiber is operating with 64 WDM channels) switch at the expense of limited extra penalty and latency.